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Issue 2, 2018
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Structure and dynamics of the radical cation of ethane arising from the Jahn–Teller and pseudo-Jahn–Teller effects

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Abstract

The pulsed-field-ionization zero-kinetic-energy photoelectron spectrum of C2H6 has been recorded in the region of the adiabatic ionization threshold. The partially rotationally resolved spectrum indicates the existence of several vibronic states of C2H6+ with less than 600 cm−1 of internal excitation. The analysis of the rotational structures assisted by ab initio calculations enabled the determination of the adiabatic ionization energy of C2H6 and the investigation of the structure and dynamics of C2H6+ at low energies. The ground state of C2H6+ is found to be a 2Ag state of diborane-like structure with strongly mixed (a1g)−1 and (eg)−1 configurations. The vibrational structure reveals the importance of large-amplitude nuclear motions involving the diborane distortion modes, the C–C stretching motion, and the internal rotation at elongated C–C distances. The spectrum is analyzed in the light of the information obtained in earlier studies of C2H6+ by ab initio quantum chemistry, EPR spectroscopy and photoelectron spectroscopy.

Graphical abstract: Structure and dynamics of the radical cation of ethane arising from the Jahn–Teller and pseudo-Jahn–Teller effects

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Publication details

The article was received on 10 Oct 2017, accepted on 04 Dec 2017 and first published on 13 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06907C
Phys. Chem. Chem. Phys., 2018,20, 1072-1081

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    Structure and dynamics of the radical cation of ethane arising from the Jahn–Teller and pseudo-Jahn–Teller effects

    U. Jacovella, C. J. Stein, M. Grütter, L. Freitag, C. Lauzin, M. Reiher and F. Merkt, Phys. Chem. Chem. Phys., 2018, 20, 1072
    DOI: 10.1039/C7CP06907C

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